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Chrome Spinels in Carbonate Veins of the Onguren Complex, Western Baikal Region

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Abstract

Chrome spinels in carbonate veins of the Onguren Complex, East Siberia, Western Baikal region are predominantly ferrichromite and chrommagnetite (MgO ≤ 0.3 wt %, Mg# ≤ 0.04, Al2O3 ≤ 2.5 wt %; Cr# 0.91–1.00, Fe2+/Fe3+ 0.8–1.4) with a high ZnO content (0.9–4.6 wt %). In the calcite vein, titanian chrome-magnetite is transformed into Cr-bearing titanomagnetite, which decomposes into Ti-depleted magnetite and ilmenite at temperature of 970–1000°С and \({{f}_{{{{{\text{O}}}_{{\text{2}}}}}}}\) approximately of +0.5…+0.7 QFM. In the dolomite vein, ferrichromite and chrome-magnetite grains contain relict cores of subferrialumochromite (Al2O3 10.6–14.4 wt %, Cr# 0.63–0.73, Fe2+/Fe3+ 4.1–5.2, MgO ≤ 0.52 wt %) with elevated ZnO (3.7–5.1 wt %), TiO2 (3.2–4.1 wt %), and MnO (0.6–1.1 wt %). Ferrichromite and chrome-magnetite are formed during the high-temperature (>600°C) metamorphism of the vein. Superimposed deformations under greenschist facies conditions lead to the formation of magnetite rims around chrome-magnetite grains.

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ACKNOWLEDGMENTS

We are grateful to the anonymous reviewer, whose critical comments substantially improved the manuscript.

Funding

This study has been supported by the Russian Foundation for Basic Researches (project no. 17-05-00819) and Russian Science Foundation (project no. 18-17-00101).

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Authors and Affiliations

  1. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, Russia

    V. B. Savelyeva & E. P. Bazarova

  2. Geological Institute, Siberian Branch, Russian Academy of Sciences, 670047, Ulan-Ude, Russia

    E. A. Khromova

Authors
  1. V. B. Savelyeva
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  2. E. P. Bazarova
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  3. E. A. Khromova
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Correspondence to V. B. Savelyeva or E. A. Khromova.

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Translated by I. Baksheev

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Savelyeva, V.B., Bazarova, E.P. & Khromova, E.A. Chrome Spinels in Carbonate Veins of the Onguren Complex, Western Baikal Region. Geol. Ore Deposits 62, 652–668 (2020). https://doi.org/10.1134/S1075701520070107

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